Home / 15,678.81-21,624.08-13,786.45

Finding the Fourth Proportional to 15,678.81, 21,624.08 and 13,786.45

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Solution

The fourth proportional to 15,678.81, 21,624.08 and 13,786.45 is: 19,014.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.81 : 21,624.08 = 13,786.45 : x
  2. Step 2: Convert to fraction form
    15,678.81/21,624.08 = 13,786.45/x
  3. Step 3: Cross multiply
    15,678.81x = 21,624.08 × 13,786.45
  4. Step 4: Simplify right side
    15,678.81x = 298,119,278.12
  5. Step 5: Solve for x
    x = 298,119,278.12/15,678.81
  6. Step 6: Final answer
    x = 19,014.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.